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Modulator and Demodulator Schematics

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Add-on modulator has high bandwidth

Add-on modulator has high bandwidth

the output of a continuous-wave (CW) source to either an amplitude-modulation (AM) or a suppressed-carrier-modulation (SCM) format, circuit has unity gain and 50 Ohm input and output impedances, frequency response is flat from 0.3 to 45 MHz

http://www.edn.com/archives/1998/091198/19di.htm

100 MHz modulated RF source

100 MHz modulated RF source

can be used to tune up 100 MHz TRF stages.

http://72.41.86.92/dproj/100ms/100s.htm

OOK, ASK and FSK Modulation in the Presence of an Interfering Signal

OOK, ASK and FSK Modulation in the Presence of an Interfering Signal

A performance comparison. ASK wins.

http://www.rfm.com/corp/appdata/ook.pdf